the lapd and fbi are on the trail of the mystery white powder which turned out not to be anthrax. >> you do a 360 around the package where it came from that can give you lead. >> reporter: bristol was doing her dance for survival. >> bristol get the aggression out it works! >> reporter: nick watt, abc news, los angeles. >> a lot of twisted peoplen the word. wow. >> my goodness. don't vote for her. don't have to send her white powder. >> relax, everybody. it is a dancing show. woo. more from abc next. >>> this morning on "world news now" -- unprecedented attack. state department officials reveal vivid new details of last month's deadly assault in libya. >> the information comes ahead of a key hearing today on capitol hill. it is wednesday, october 10th. >> announcer: from abc news this is "world news now." >>> good wednesday morning. i'm sunny hostin in for paula faris. >> always good to have you back, sunshine. >> good to be here. >>> good morning, everybody. i'm rob nelson. we'll get to the dramatic revelations about the rampage in benghazi in a moment. >>> also, jerry sandusky's da